Surface Pro 6 has significantly better battery life than last year's model

Best answer: Battery life on the Core i5 model is substantially better than the last Surface Pro while also running cooler.
Microsoft: Surface Pro 6 (from $899)Significant improvement on the previous model

During the course of our Surface Pro 6 review battery life was one of the key metrics we benchmarked. Using the PC Mark 8 Home Battery test, the Surface Pro 6 came away with a score of 5 hours and 25 minutes.